Abstract: This paper takes the remote lower protective layer 11^# coal seam mining to protect main 3^# coal seam as the research object in Songshuping Coal Mine. It is concluded that it is reasonable to arrange 3314 floor gas drainage roadway at the bottom 15 m of the 3^# coal seam through arranging through beds grid format upholes in floor roadway to extract the protective layer and carry out pressure relief gas. The actual extraction data show that during the mining of the long-distance protective layer, the influence of the mining can effectively relieve the pressure and improve the permeability of the protective layer. The pre-pumping rate of the drainage area is about 65.6%. According to the effect analysis of pressure relief gas extraction, 11^# coal seam after the protection of the working layer in front of 10 m to the protective layer of the face of 60 m within the corresponding overlying 3^# coal seam is the best pressure relief gas extraction area.